Compact fuel pump assembly

Abstract

The invention relates to the technical field of fuel pump systems, and discloses a compact fuel pump assembly which comprises a pump body, an oil suction device and an oil outlet device, one end of the pump body is connected with the oil suction device and used for sucking oil in an oil tank, and the other end of the pump body is connected with the oil outlet device and used for conveying oil to an external engine. The oil pump assembly further comprises an integrated flange assembly used for fixing the pump body, and the integrated flange assembly is fixed to an opening of an external oil tank in a sealed mode. The oil suction device comprises a filter screen assembly matched with the inner wall of the oil tank during installation and an oil suction pipe used for connecting the filter screen assembly and the pump body, and the filter screen assembly comprises a first filter screen and a filter screen framework used for fixedly supporting the first filter screen; according to the oil suction device, the filter screen assembly of the oil suction device is of a long-strip-shaped rough filtering structure, larger-area filtering coverage and multi-direction oil suction capacity are achieved, and the oil suction reliability of the fuel pump under the working conditions of low oil level or vehicle posture change is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of fuel pump system technology, specifically to a compact fuel pump assembly. Background Technology

[0002] Existing vehicle fuel pump systems are typically equipped with filter assemblies to remove particulate impurities from the fuel, preventing these impurities from entering the fuel pump body and high-pressure fuel tank, thus avoiding wear, clogging, and performance degradation. However, existing filters are mostly sheet-like or cup-shaped structures, which, while compact, have limited filtration area and a single fuel suction direction, making it difficult to meet the multi-angle fuel suction requirements when the vehicle's fuel tank undergoes complex changes in orientation.

[0003] Especially when the fuel level drops or the vehicle tilts or rolls over, traditional filters, due to their location and structural limitations, cannot cover the variable areas of fuel storage in the fuel tank, leading to fuel pump idling, overheating, and fuel supply interruption, which in turn affects the overall vehicle's power stability and safety performance.

[0004] Therefore, to address the inadequacy of existing requirements, we propose a compact fuel pump assembly. Summary of the Invention

[0005] This invention provides a compact fuel pump assembly with multi-directional oil suction capability, capable of handling oil level drops, changes in posture, or tilting conditions. It features a highly integrated structure and achieves the beneficial effects of modular assembly design, thus solving the problems mentioned in the background art.

[0006] This invention provides the following technical solution: a compact fuel pump assembly, comprising a pump body, a fuel suction device, and a fuel outlet device. One end of the pump body is connected to the fuel suction device for absorbing fuel from the fuel tank, and the other end of the pump body is connected to the fuel outlet device for delivering fuel to an external engine. The fuel pump assembly further includes an integrated flange assembly for fixing the pump body, the integrated flange assembly being sealed and fixed at the opening of the external fuel tank. The fuel suction device includes a filter assembly that mates with the inner wall of the fuel tank during installation and a fuel suction pipe for connecting the filter assembly and the pump body. The filter assembly includes a first filter and a filter frame for fixing and supporting the first filter. During installation and use, the integrated flange assembly securely seals the fuel pump assembly at the opening of the fuel tank, the filter assembly mates with the inner bottom surface of the fuel tank, and the pump body operates to pump fuel from the fuel suction device to the fuel outlet device.

[0007] As an alternative to the compact fuel pump assembly described in this invention, the end face structure of the filter assembly is a long strip structure, with its length being more than twice its width and less than the length of the fuel tank. The filter assembly can cover a large area of ​​the bottom of the fuel tank, so that the filter assembly can still stably draw in fuel when the vehicle body is tilted, thereby enabling it to stably supply fuel to the pump body.

[0008] As an alternative to the compact fuel pump assembly described in this invention, the first filter screen further includes at least one second filter screen, which is spliced ​​to the first filter screen via a detachable structure to modularize the filter screen assembly so that it can be assembled according to the inner bottom surface structure of the fuel tank.

[0009] As an optional solution for a compact fuel pump assembly according to the present invention, the first filter screen is a fine filter with a small pore size, and the second filter screen is a coarse filter with a large pore size. The first filter screen has a filter element with a mesh diameter of 25-80 μm, and the second filter screen has a filter element with a mesh diameter of 150-400 μm, so as to perform graded filtration of fuel and provide a bypass for fuel supply, thereby avoiding clogging of the first filter screen, which is a fine filter.

[0010] As an alternative to the compact fuel pump assembly described in this invention, the first filter screen is wrapped around the filter screen frame, and the filter screen frame improves the strength of the filter screen assembly and maintains the structural integrity of the filter screen assembly.

[0011] As an alternative to the compact fuel pump assembly described in this invention, the first filter screen has a multi-layer composite structure, consisting of a synthetic fiber mesh layer, a stainless steel wire mesh layer, and a composite material mesh layer from the inside out, and the filter screen skeleton is a mesh cover woven from nylon threads.

[0012] As an alternative to the compact fuel pump assembly described in this invention, a bracket is provided on one side of the pump body, the bracket being used to fix the pipeline and the pump body and to house them inside the fuel tank.

[0013] As an optional solution for a compact fuel pump assembly according to the present invention, it further includes a suction box, which has several suction ports opened in multiple directions. The suction box and the suction pipe are connected by a pluggable structure, which allows for quick disassembly and installation of the suction box to improve the convenience of transportation and installation.

[0014] As an alternative to the compact fuel pump assembly described in this invention, the integrated flange assembly includes a flange body sealed and installed at the opening, a pressure regulating device integrated on the flange body, a return oil pipe connected to the flange body through the pressure regulating device, and an electrical connection device for controlling the pressure regulating device installed on the flange body.

[0015] The present invention has the following beneficial effects:

[0016] 1. In this invention, the filter assembly of the oil suction device adopts a long strip coarse filter structure, which realizes a larger area of ​​filtration coverage and multi-directional oil suction capability, significantly improving the oil suction reliability of the fuel pump under conditions of low oil level or vehicle posture change.

[0017] 2. In this invention, the filter assembly adopts a double-layer filter structure design. One layer is a fine filter to ensure fuel purity, and the other layer is a large-pore filter to provide a bypass channel, ensuring that fuel flow is maintained even when the main filter is clogged, thereby improving system reliability.

[0018] 3. In this invention, the modular filter assembly allows for diverse installation options to flexibly adapt to different vehicle fuel tank shapes and complex installation spaces, meeting the needs of diverse vehicle platforms. Furthermore, the modular splicing function facilitates later maintenance and adaptation to different fuel tank structures, improving maintenance efficiency and operational flexibility.

[0019] 4. In this invention, the return oil pipe is directly connected to the pressure regulating device on the integrated flange assembly, and the return oil pipe body and its other end are directly arranged in the oil tank, thereby eliminating the traditional oil storage tank and return oil trough, reducing the number of parts and assembly complexity, reducing potential leakage points, and improving the overall sealing performance and reliability of the system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the installation structure of a compact fuel pump assembly according to the present invention; Figure 2 This is an exploded view of the integrated flange assembly in this invention; Figure 3 This is a three-dimensional structural diagram of the bracket in this invention; Figure 4 This is a three-dimensional structural diagram of the filter assembly in this invention; Figure 5 This is a three-dimensional structural diagram of the oil suction pipe in this invention; Figure 6 This is a left-side structural schematic diagram of a compact fuel pump assembly according to the present invention; Figure 7 This is a cross-sectional view of the filter assembly in this invention; Figure 8 This is a bottom view structural diagram of the filter assembly in this invention; Figure 9 This is a schematic diagram of the oil circuit of a compact fuel pump assembly according to the present invention.

[0021] In the diagram: 1. Pump body; 100. Bracket; 2. Oil suction device; 20. Filter screen assembly; 21. Oil suction pipe; 22. Oil suction box; 200. First filter screen; 201. Filter screen frame; 202. Second filter screen; 3. Oil outlet device; 4. Integrated flange assembly; 41. Flange body; 42. Pressure regulating device; 43. Oil return pipe; 44. Electrical connection device. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-9 As shown:

[0024] A compact fuel pump assembly includes a pump body 1, a fuel suction device 2, and a fuel outlet device 3. One end of the pump body 1 is connected to the fuel suction device 2 for absorbing fuel from the fuel tank, and the other end of the pump body 1 is connected to the fuel outlet device 3 for delivering fuel to the external engine. The pump body 1 draws fuel from the fuel tank through the fuel suction device 2 and delivers the fuel to the engine through the fuel outlet device 3 for the engine to consume during operation.

[0025] The oil suction device 2 includes a filter screen assembly 20 that fits into the inner wall of the oil tank during installation and an oil suction pipe 21 for connecting the filter screen assembly 20 and the pump body 1. The pump body 1 is connected to the filter screen assembly 20 through the oil suction pipe 21. When the pump body 1 is working, the pump body 1 directly draws fuel from the oil tank through the oil suction pipe 21 and the filter screen assembly 20.

[0026] The end face structure of the filter assembly 20 is a long strip structure, with its length being more than twice its width and less than the length of the oil tank. Compared with the existing structure, in this embodiment, the filter assembly 20 is used as the oil suction end and is connected to the pump body 1 through the oil suction pipe 21. Its long strip structure allows the pump body 1 to perform stable suction when pumping oil, regardless of whether the vehicle body tilts forward, backward, left, or right, thereby ensuring stable oil supply from the pump body 1.

[0027] The working principle of this implementation is as follows: In use, the pump body 1, the oil suction device 2, and the oil outlet device 3 are first installed on the fuel tank. At this time, the pump body 1 and the oil suction device 2 are set inside the fuel tank. The output end of the pump body 1 is connected to the engine through the oil outlet device 3. The suction end of the pump body 1 is connected to the filter assembly 20 through the oil suction pipe 21. When the pump body 1 is started, the pump body 1 uses the oil suction pipe 21 to make the filter assembly 20 draw fuel from the fuel tank and deliver the drawn fuel to the engine through the oil outlet device 3. Compared with the existing fuel pump assembly, in this implementation, the oil suction end is a long strip-shaped filter assembly 20, and the filter assembly 20 cooperates with the inner bottom wall of the fuel tank, so that it can cover a larger area of ​​the bottom of the fuel tank, ensuring stable fuel suction when the fuel level is low and under complex conditions such as vehicle tilting and vibration, avoiding the risk of fuel pump idling and fuel supply interruption. At the same time, its long strip-shaped and wide area can better filter the fuel to reduce impurities in the fuel entering the engine.

[0028] refer to Figures 2-3 It also includes an integrated flange assembly 4 for fixing the pump body 1. The integrated flange assembly 4 is sealed and fixed at the opening of the external oil tank. The integrated flange assembly 4 integrates the oil outlet device 3 of the pump body 1 and fixes it at the opening of the oil tank so as to fix the position of the oil outlet device 3 of the pump body 1 and avoid the problem of oil leakage caused by the shaking of the oil outlet device 3.

[0029] The integrated flange assembly 4 includes a flange body 41 that is sealed and installed at the opening of the fuel tank. A pressure regulating device 42 is integrated on the flange body 41. An electrical connection device 44 for controlling the pressure regulating device 42 is also installed on the flange body 41. Fuel output from the fuel outlet device 3 enters the engine pipeline through the flange body 41. When entering, it flows through the pressure regulating device 42. The pressure regulating device 42 can adjust the direction of the fuel according to the fuel flow and pressure. The flange body 41 is connected to a return fuel pipe 43 through the pressure regulating device 42. The return fuel pipe 43 is located in the fuel tank. When the fuel pressure is too high, the fuel is guided by the pressure regulating device 42 to the return fuel pipe 43 so that the fuel is returned to the fuel tank through the return fuel pipe 43.

[0030] A bracket 100 is provided on one side of the pump body 1. The bracket 100 is used to fix the pipeline and the pump body 1 and place them in the oil tank. The bracket 100 fixes the suction pipe 21 and the return pipe 43 to the two opposite ends of the pump body 1 respectively to fix and bind the pipeline and prevent the pipeline from swaying due to the vehicle body tilting. The suction pipe 21 and the return pipe 43 can be fixed by binding with cable ties and clamps.

[0031] The working principle of this embodiment is as follows: During use, the flange body 41 fixes the oil outlet device 3 of the pump body 1 to the opening of the oil tank and seals the opening of the oil tank. At this time, the pump body 1 and the oil suction device 2 are located inside the oil tank, and the filter screen assembly 20 in the oil suction device 2 fits into the bottom surface of the oil tank, so that the pump body 1 can stably perform oil suction. The pressure regulating device 42 is controlled by the integrated flange assembly 4 through the integrated electrical connection device 44, so that the pressure regulating device 42 regulates the flow rate and pressure of the fuel flowing out of the oil outlet device 3 through the return oil pipe 43. Compared with the existing fuel pump assembly, this embodiment eliminates the common oil storage tank or return oil trough structure, reduces the number of components, improves the sealing performance and durability of the overall system, and helps to reduce the risk of fuel leakage and external pollution.

[0032] refer to Figure 7 The filter assembly 20 includes a first filter 200 and a filter frame 201 for fixing and supporting the first filter 200. The first filter 200 covers the outer layer of the filter frame 201. The filter frame 201 improves the strength of the filter assembly 20 and maintains the structural integrity of the filter assembly 20. The filter frame 201 is a rigid or semi-rigid structure to fix and support the first filter 200.

[0033] The first filter 200 has a multi-layer composite structure. From the inside out, the first filter 200 consists of a synthetic fiber mesh layer, a stainless steel wire mesh layer, and a composite material mesh layer. The filter frame 201 is a mesh cover woven from nylon threads. The multi-layer filtration structure can accurately intercept impurities, thereby reducing cylinder vibration caused by impurities entering the engine.

[0034] In this embodiment, the filter assembly 20 is directly mounted on the bottom surface of the oil tank, and the length of the long strip filter assembly 20 can be arranged to follow the oil tank structure to ensure large-area oil absorption.

[0035] It should be noted that the covering relationship between the first filter screen 200 and the filter screen frame 201 in the filter screen assembly 20 can be designed in various ways. In this embodiment, the first filter screen 200 covers the filter screen frame 201. Alternatively, the filter screen frame 201 can be designed in a shell shape to cover the core-shaped first filter screen 200. As long as the filter screen assembly 20 can maintain its structural integrity in the oil tank, it is acceptable.

[0036] refer to Figure 8 The first filter 200 also includes at least one second filter 202. The second filter 202 is spliced ​​with the first filter 200 through a detachable structure. The filter assembly 20 is assembled from at least one first filter 200 and several second filters 202, thereby modularizing the filter assembly 20. During installation, it can be adjusted according to the contour and size of the bottom surface of the fuel tank, so that it can be installed in a variety of ways to suit different fuel tanks and meet the needs of different vehicle models.

[0037] In this implementation, the fuel pump assembly and the fuel suction device 2, especially the filter assembly 20, are designed with a high degree of modularity, enabling diverse installation to flexibly adapt to the fuel tank shape of different vehicle models and complex installation space, thus meeting the needs of diverse vehicle platforms.

[0038] refer to Figures 6-8 The first filter screen 200 is a fine filter with a small pore size, and the second filter screen 202 is a coarse filter with a larger pore size. The first filter screen 200 has a filter element with a mesh diameter of 25-80 μm, and the second filter screen 202 has a filter element with a mesh diameter of 150-400 μm. The difference from the previous embodiment is that in this embodiment, the first filter screen 200 and the second filter screen 202 simultaneously perform oil suction operation and filter fuel for the pump body 1. At this time, the pump body 1 draws oil from the first filter screen 200 and the second filter screen 202 through the oil suction pipe 21, so that the filter screen assembly 20 provides two oil supply passages to the pump body 1 through the oil suction pipe 21.

[0039] Specifically, the first filter screen 200 and the second filter screen 202 are located at opposite ends of the oil suction pipe 21 and are connected to the oil suction pipe 21 through an internal channel, so as to achieve the purpose of simultaneously supplying oil to the pump body 1 through the oil suction pipe 21.

[0040] In this embodiment, the filter assembly 20 adopts a double-layer filter structure design. The first filter 200 is a fine filter to ensure fuel purity, and the second filter 202 is a large-pore filter to provide a bypass channel, ensuring that fuel still flows when the first filter 200 is clogged, thereby improving the reliability of the fuel pump assembly.

[0041] refer to Figure 5 The oil pump assembly also includes an oil suction box 22, a filter assembly 20 is disposed inside the oil suction box 22, the oil suction box 22 has several oil suction ports in multiple directions, and the oil suction box 22 and the oil suction pipe 21 are connected by a pluggable structure.

[0042] In this embodiment, by placing the filter assembly 20 in the oil suction box 22, the oil suction box 22 can provide further protection for the filter assembly 20, thereby improving the corrosion resistance and service life of the filter assembly 20. Moreover, by providing a pluggable structure between the oil suction box 22 and the oil suction pipe 21, it can be quickly separated and installed, thereby improving the convenience of transportation and reducing the cost of maintenance.

[0043] In summary, the filter assembly 20 in the fuel suction device 2 adopts a long strip coarse filter structure, achieving a larger filtration coverage and multi-directional fuel suction capability, significantly improving the fuel pump's fuel suction reliability under conditions of low fuel level or vehicle attitude changes. The modular filter assembly 20 allows for diverse installation options, flexibly adapting to different vehicle fuel tank shapes and complex installation spaces, meeting the needs of diverse vehicle platforms, improving the system's environmental adaptability and service life, and ensuring stable operation of the vehicle's fuel supply system under various extreme conditions. Furthermore, by directly connecting the return fuel pipe 43 to the pressure regulating device 42 on the integrated flange assembly 4 and placing the pipe body and its other end directly in the fuel tank, the components of the fuel pump assembly are greatly simplified. This allows for a modular and compact layout of the fuel pump assembly's parts, simplifying the assembly structure and reducing manufacturing and assembly costs.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A compact fuel pump assembly, characterized in that: It includes a pump body (1), an oil suction device (2) and an oil outlet device (3). One end of the pump body (1) is connected to the oil suction device (2) for sucking oil from the oil tank, and the other end of the pump body (1) is connected to the oil outlet device (3) for delivering oil to the external engine. The oil pump assembly also includes an integrated flange assembly (4) for fixing the pump body (1), the integrated flange assembly (4) being sealed and fixed to the opening of the external oil tank; the oil suction device (2) includes a filter assembly (20) that fits with the inner wall of the oil tank during installation and an oil suction pipe (21) for connecting the filter assembly (20) and the pump body (1). The filter assembly (20) includes a first filter (200) and a filter frame (201) for fixing and supporting the first filter (200). During installation and use, the integrated flange assembly (4) fixes and seals the oil pump assembly at the opening of the oil tank. The filter assembly (20) cooperates with the bottom surface of the oil tank. The pump body (1) works to pump the oil in the oil tank from the oil suction device (2) to the oil outlet device (3).

2. A compact fuel pump assembly according to claim 1, characterized in that: The first filter (200) further includes at least one second filter (202), which is connected to the first filter (200) by a detachable structure.

3. A compact fuel pump assembly according to claim 1, characterized in that: The end face structure of the filter assembly (20) is a long strip structure, the length of which is more than twice the width and less than the length of the oil tank.

4. A compact fuel pump assembly according to claim 1, characterized in that: The first filter (200) wraps the outer layer of the filter frame (201), and the filter frame (201) increases the strength of the filter assembly (20) and maintains the structure of the filter assembly (20).

5. A compact fuel pump assembly according to claim 2, characterized in that: The first filter (200) is a fine filter with a small pore size, and the second filter (202) is a coarse filter with a large pore size.

6. A compact fuel pump assembly according to claim 5, characterized in that: The first filter screen (200) has a filter element with a mesh diameter of 25 to 80 μm, and the second filter screen (202) has a filter element with a mesh diameter of 150 to 400 μm.

7. A compact fuel pump assembly according to claim 1, characterized in that: The first filter screen (200) has a multi-layer composite structure. From the inside to the outside, the first filter screen (200) consists of a synthetic fiber mesh layer, a stainless steel wire mesh layer and a composite material mesh layer. The filter screen skeleton (201) is a mesh cover woven from nylon threads.

8. A compact fuel pump assembly according to claim 1, characterized in that: A bracket (100) is provided on one side of the pump body (1), the bracket (100) is used to fix the pipeline and the pump body (1) and place them in the oil tank.

9. A compact fuel pump assembly according to any one of claims 1 to 8, characterized in that: The oil pump assembly also includes an oil suction box (22), the filter assembly (20) is disposed in the oil suction box (22), the oil suction box (22) has several oil suction ports in multiple directions, and the oil suction box (22) and the oil suction pipe (21) are connected by a pluggable structure.

10. A compact fuel pump assembly according to claim 1, characterized in that: The integrated flange assembly (4) includes a flange body (41) sealed at the opening, a pressure regulating device (42) integrated on the flange body (41), a return oil pipe (43) connected to the flange body (41) via the pressure regulating device (42), and an electrical connection device (44) for controlling the pressure regulating device (42) also installed on the flange body (41).

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